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oct. s, 1936. , F. Q_ HOLTZ . ' y 2,056,400 TIME swITcH Filed Feb. 6, 1933 3 Sheets-Sheet l 25. ,f 82. ‘IWL ¿, - Oct. ‘ 6, 1936. 2,056,400 vF. c. HOL-rz TIME SWITCH »Filed Feb. e, 195s 3 Sheets-Sheet 2 ~ J7? venía l f'îedën'df ÚÍÍO ZZ'Z. f-B/Hí/ ßmlw, ma. ,5. Oct. -6, 1936. F_ C, HOL-r2 2,056,400 TIME SWITCH Filed Feb. 6,V 1953 3 Sheets-Sheet 3 Patented Oct. 6, 1936 ~ 2,056,400 UNITED STATES PATENT OFFICE y z,0ss,40o 'man swrron Frederick C. Bolts, Springfield, Ill., assignor to Sangamo Electric Company, Springñeid, Iii., a corporation oi' Illinois Application February 6, 1933, Serial No. 655,355 23 Claims. (Cl. 20D-39) 'I'he present invention relates to time switches. ond tripping operation respond to relatively small In one embodiment oi my invention herein shown, the device is particularly adapted to func tion as an electric range timer for automatically s turning on the heating element of an electric range at any selected time and for automatically turning oi! this heating element at a later se lected time; ‘and in another embodiment of my invention herein shown, the vdevice is particular l0 ly adapted to function as an interval timerfor , opening or otherwise controlling a particular cir cuit yat the expiration of a definite time interval, which time interval can be accurately predeter mined based on comparatively short umts of vlli time. While the above embodiments are the preferred constructions ‘and uses of my inven tion, nevertheless it will'be understood that my invention is not limited thereto but can also be embodied in other constructions and used for go other purposes. subdivisionsof time. Another object of the invention is to provide an improved arrangement whereby the switch contacts can be manually tripped into closed po- 5 sition in the event that the meer should desire to control the circuit by a manual switch at some ‘ other point. In the preferred embodiments here in shown, this manual tripping' of the switch contacts to closed position is enacted by a third l0 stage of return movement of ìsaid control mem ber, this third tripping operation being effected manually. 1 _ A Another object of the invention is to provide an improved time switch of the abovegeneral l5 description wherein the time tripping functions can be quickly and easily adjusted to different time intervals from the exterior of the device, and wherein the switch can be> quickly and eas ily, tripped in the manual tripping operation, so 20' The actuation o_f Àthe switch contacts is gov-A that the housewife or'other user can perform yerned by a control member which is initially c moved in one direction into a set position by manual operation. _ Spring means normally these operations without complication or incon venience. _ __ Another object of the invention is to provide an improved construction and arrangement of 25 >the two time controlled tripping devices and their associated timeresponsiv'e driving mem bers, relatively to which the tripping devices can tacts at the selected predetermined time or'times. » be given different time settings. Other objects and advantages of the invention s0 30 This return movement is `governed by time con g description of two trolled'tripping or releasing devices which can will appear from the foll 25 tends to move this control member in the op posite direction, back to a normal position. It is this spring actuated return movement of said control member which actuates the switch con be given any desired time setting. _ One of the objects of the invention is to pro v vide an improved construction of time switch' 35 wherein this return motion of said control mem ber occurs in two stages or steps. Assuming the control member to have been manually moved into its set position. the nrst tripping step oc curs at the end of a predetermined time interval 40 and allows the control member to move back' part way through its return motion. It is held at this point until the expiration of a second'time in terval, whereupon the second tripping or releas ling device permits said control member to move 45 back through asecond stage of its return move ment. In the, electric range timer embodiment of my invention. this two-step operation is uti liaed to predetermine the times when _the switch goes into the l‘On” position and goes into the 60 "08” position; and in the interval timer em bodiment of my invention this two-step opera tion is? advantageously utilized by having the first tripping operation respond to relatively u large divisions of time and by having th'e sec preferred embodiments o my invention. In the accompanying drawings trating such embod iments-f ` '_ Figure 1 is a front elevational view of the 35 range timer embodiment of my invention; ' Figure 2 is a rear elevational view of thel same, with portions broken away; ' Figure 3 is a sectional view on an enlarged scale, taken approximately on the plane of the 40 line S-I of Figure 1; . _Figure 4 is a fragmentary perspective view,- with portions broken away; _ _' Figure 5 is a detail _view of the control arm. illustrating the pivcœd mounting of me latch 45 thereon; . ’ Figures 6, '1, 8 and 9 are diagrams illustrating successive positions of the switch control member and the relations of the switch contacts in each 5o of these positions of said control member; Figure 1_0 is a front elevational view of the in terval timer embodiment of my inventiom' Figure l1 is a iront view- with the lower por tion of the casing or supporting frame broken u 2 accesso away to illustrate the gear train, tripping parts, etc.: and enlarged scale, looking upwardly as indicated be extended Ato e. terminal post, er posts.l de, mounted on the rear insulating'panel dl. The cam d5 is oscillated into its diñferent posh tlons by a switch control member designated di by the line iä-IZ of Figure 11. The main frame structure of the device com=prises front and rear frame plates it and is in its entirety. This control member comprises a shait dla, an oscillating arm dit iinedly secured to said shaft, a latch die pivotally mounted on Figure 12 is a horizontal sectional view on an which are fastened in spaced relation by corner. the outer end or said arm, and an actuating knob . spacing 'posts 2l. A face plate 22 is mounted did on the front end or the shaft die. The cam in spaced relation to the front frame plate it by' d5 is ?lxedly secured to the rear end. of said shaft. screws 2t which thread into spacing pests 2d rig idly secured to the front frame plate lo. All of the visible indicating parts are associated with this i’ace plate 22, including the clock dial 25, clock rc hands 2li, and the other dials and pointers associ=ated with the tripping apparatus to be later dem` scribed. A ñnishing bead El extends around the marginal portions oi’ the face plate 2t, and when ' >the device is assembled in a casing or is built into an electric range, the enclosing wall extends to this finishing bead 2l. ' The shaft has suitable bearing support in the iront and rear frame plates id, i9, for rotative movement and for axial sliding movement. A target or indicating disc et is secured fast to the shaft 5ta, the front face of said disc bearing the successive indicia: “Set”, “On”, À“Oiî”; followed by a red target area designated 53. In the oscil lation of the shaft 5ta these are presented suc cessively in a sight Window 5d provided 'in the 20 lower portion of the face plate 22. The arm lith is secured to the shaft Eta at a - ’ The clock 25, 2t may be of the spring=-wound point between the two frame plates I8 and it. Re ferring to Figures d and 5, said arm has a spool shaped huh- portion äl' which is rigidly secured to the shalt Sie, as by pinning or in any other suitable manner, whereby the arm oscillates with the shaft and also moves bodily with the shaft type, electric motor driven type, or ci the sec ondary type, receivingimpulses from a master clock or other control source. In the embodi ment disclosed, I have illustrated a motor driven type of clock, comprising a self-starting synchro nous motor 8l, particularly for installations . in the amai shitting movement of the latter. A coil spring 5d is conñned around the shaft be= where alternatingA current is available. This mo tor ti may be mounted on thebaclr side of the tween the hub 5l and the back plate' iii. The rear frame plate it, as shown in'mgure 2. The iront end oi’ said spring is extended outwardly driving train from the electric motor to the clock and provided with a hooked extremity 58' which hands, and such other details oi’ the cloch-move= hooks over the side edge oi the arm dit. The ment, have not been illustrated because the same other end 5d" ci’ said spring bears against the 35 are old and well known. .A second hand 26’ ' iFlg= ure 1) or a second disc 2t", (Figure lil) is pret= erably provided to indicate whether or not the cloclr is operating. ' In the range timer embodi» ment illustrated in Figures l-Ji, a gear 532 transe mits thrncdv motion from the clock movement to 'fthe tripping parts associated with the switch control member, which tripping parts will be later described. - „ Referring now to the arrangement of the switch contacts, as illustrated in Figures 2 and él, the stationary and movable contacts 33 and-dii, re“n spectively, are mounted on ila-shaped bars 35 and The latter are secured to the outer sides or spaced terminal blocks 3l and 3S composed of insulation, these terminal blocks being secured to an insulating panel 39 which is secured to the bach side of the rear frame plate it. The L-= ` shaped supporting bar 35 for the contact 8d holds _said contact in substantially stationary relation, while the L-shaped supporting bar 3o for. the bottom contact til can be forced or sprung down stop pin E@ projecting forwardly from the' back 35 plate itl. Said spring acts as a torsion spring, normally tending to swing the switch control assembly die, Elib, in a counterclockwise direc tion (as viewed from the iront of the device). and it also serves as a compression spring re-= 40 acting against the baclr plate i9 and tending to thrust the control assembly forwardly. The latch or dog die is pivotally mounted for sidewise swinging movement on the outer end oi arm Eäib, oscillating about a pivot stud or'screw di which is secured to the arm. The normal position of said latch or dog is with the outer beveled nose portion Sie extending outwardly sub- , stantially in prolongation of the arm Sib. .es in-a dicated by the dotted line position in Figure 5, said latch can swing in one direction relatively to this normal position, such swinging motion being against L the pressure ci a coil spring @2. The outer end oi said spring passes through an aper= tured lug @if on the dog and the other end oi’ the 55 spring is hoolredover the side oi the arm till», the intermediate convolutions of the spring being coiled about the forwardly projecting portion oi’ the hub 5l. A stop shoulder dlg projects backn wardly forseparating the contacts. .el copper conducting strip il@ aids in carrying current to @ai the movable contact, and a reenforcing bar ¿33 .wardly from the opposite edge of the dog for 60 prevents flexing of the horizontal leg portion ci. engaging the baci: edge of the arm cib, this stop supporting member 36. .ii/strip of insulationl ¿lil preventing swinging motion of the dog in the is secured to the top side of this horizontal leg, oppositedirection from its normal position, and and the cam ¿35, which actuates the switch, is the action or? the spring 62 being such as to nor= i adapted to contact with this strip of insulation. molly hold this stop shoulderagainst the arm cib. titiV The conductors of the circuit to be controlled are Figures 6,- ?,78 and 9 diagrammatically illus@ adapted to be connected to the terminal screws trate how the switch control member @l con d@ threading into the terminal blocks tl, sa. A operates with three' tripping or releasing members rear insulating panel #il is suitably secured to t5, @d and @l which are grouped substantially the back sides oi’ said terminal blocks, for en concentrically about the rotative axis of the con» closing the rear portion oi the switch structure. trol member 5i.' The tripping members t5 and et The conductors fit of the electric motor di may are time responsive; in the preferred construe» be connected to the terminal screws de, or, ‘wherev tion illustrated, they consist of rotating shafts independentV circuit connections for said motor are which have geared connection with the clock. desired, these conductors, or one of them, may Cut in said shafts are notches tta and Soc, respec» . 3 2,056,400 only. ' 'mess m. man» ìt «ad n mais is the lib between said frame plates. Mounted on said counterclockwise direction indicated, and when _ shafts, and rotatable with respect thereto, are . lthe bottom'of. the- notch in one of these shafts two spur gears ‘Il and 12. These two gears both arrives at a position substantially tangent to the arc A, the shaft releases the control member il. The arc A defines the path of movement of the outer extremity of the dog llc. It- will be seen from the foregoing that when the shafts Il and t8 are in any rotated positions other than with-their 10 _notches Ila and “a substantially tangent to the mesh with the aforementioned gear I! which is disposed on the front side of the front frame plate I8. The gear 32 is operatively connected through suitable gearing with the clock movement and, hence, the two spur gears 1i and 12 are both driven continuously at a time controlled speed. ~ Said gears 1| and 12 function as time responsive 10 arc A, the control member li can be latched be- _ driving members for driving the shafts 0l and Il, hind these shafts, with the dog lic engaginga solid part of the shaft. Figure 6 illustrates the The driving connection between each of these gears and its respective shaft is a friction slip set position of the control member to which it is page connection, being identical in the case of moved manually in a clockwise direction, and as ` both shafts. Referring to Figure 3, the shaft Il 15 the control member passes each- ofthe tripping is formed with a reduced bearing portion, Athe , members l5. ll and l'l in being swung to this set front edge of which defines a shoulder “b pro position, the dog lic oscillates on its'pivot screw jecting from the ront frame plate I8. A fric li in passing each of the tripping members. tion spring lâ, in ‘the form of a cupped washer or 20 >When the control member is in the position illus spider, is confined >between said shoulder “b and trated in Figure 6,» with the dog die engaging a he. adjacent side of the ge'ar 1i. This spring is solid part of the shaft Il, the coil spring I8 is maintained under continuous pressure so that it tending to swing said control member back functions to transmit a drive from gear 1i to through its return movement in a counterclock shaft Q8 by friction. The shaft 85 is formed with wise direction. Therefore, as soon as thenotch a reduced extension Btc projecting forwardly “o rotates to a position of tangency, the control from the shoulder 55h, and the companion shaft member il is tripped or released and allowed to lt is formed with alike reduced extension. Each swing to the position illustrated in Figure 7. where of the two gears 1i and 12 has a sleeve 14 rigidly the dog engages a solid part of the shaft ß. As secured to its respective gear and rotatably' soon as the notch “a of this shaft arrives in a mounted on this shaft extension. Secured fast 3° position of tangency. the control element is again to the outer-end of the sleeve associated with the tripped or released and allowed to continus gear li is a rotating dial or disc 18, and secured through a second step of return movement, until to the sleeve associated with the other gear 12 is a like rotating dial _11. As shown in Figure l, the dog strikes the third tripping member l1. 35 these two dials rotate in circular _apertures cut in The tripping release between the control mem ber andl this third stop l1 is preferably effected the face plate 25, and marked on the faces of by relative endwise movement between the control said dials is suitable time indicia 10', 11'. In a l member land said stop member. In the preferred range timer embodiment of my invention, the construction, the stop l1 consists of a short pinv two dials 1I and 'l1 are geared to make one com 40 rigidly anchored in the front frame- plate il and plete revolution every twelye hours and, accord projecting rearwardly therefrom, and the con trol member ll is tripped from said stop by press ingly, in such embodiment, the _scale markings 1l',_1'|' represent twelve hours, with minor sub ing inwardly on the knob lib, thereby lthrusting divisions oi' 15 minutes or less. It will be under the swinging arm and its dog llc inwardly be 45 yond the end of the pin I1, whereby the latter is cleared andthe control arm ‘Ib can continue through a third step’of return movement down to "so its final position illustrated in Figure _9. In other possible alternative constructions, the pin l1 might be arranged for the tripping movement. as by providing a knob on the outer end thereof and arranging said pin for sliding or rotating movement, so as to enable the inner end of the pin to be withdrawn from the path of the dog 55 llc, or so as to enable a notch in said pin. similar to the notches Ila, "a, to be slid or rotated into the path of the said dos. - ` Figures 6 to 9, inclusive illustrate the construc tion of cam 4l which is used in the rangetimer embodiment of my invention. from which> it will be seen that when the control member is in the stood that in other embodiments the geared rela' tion of the dials to the time piece may be arranged for a higher or lower rotative speed, and the dial markings would then vbe modined accordingly. Fixedly secured to the outer ends of the reduced shaft extensions llc and ttc are pointers 1B and 1l' which cooperate with the dials ‘It and 11. Printed on the face plate 2l adjacent to the rotat ing dials are two datum marks Il and l2 which cooperate with the pointers 'Il and ‘Il in indicat- _ ing whenithe automatic tripping operations willl ' occur, i. e., when the two pointers are aligned with their respective marks lli and l2, the notches lla and "a are in their tangent positions fontripping the control member il. A pin Il is passed through each of the reduced _ shaft extensions "c, tic, and has its ends bear ing against a washer Il mounted in front of each position illustrated in _Figure 6, the righthand s dial 1I, 11. This pin and washer arrangement lobe _lla of the cam is holding- the 'switch con tacts Il and M separated: when the control ele’ ment is in the position illustrated in Figure 7, the switch contacts are permitted to engage; when the control element is in the position illustrated in Figure 8. the lefthand lobe "b of the cam holds contacts' separated; and >when the control 70 the element is in the position illustrated in Figure 9, the switch contacts are permitted to engage. The two notched tripping shafts ll and II have suitable _bearing support in the front and rear 75 frame plates I8; Il.' the notches Ila and “d in sustains the end thrust of the spring spider ‘Il tending to thrust each of the gears 1I and 1I outwardly along its respective shaft. _ The manual setting of each of the tripping shafts Il and Il is enacted through separate ad iusting knobs Il and Il, both located in proximity to the setting knob lid and conveniently accessi ble from the front of the housing. These ad iusting knobs are secured to the outer ends‘of `. shafts I1 and l), respectively, which have bearing support in the' front and rear frame plates Il and II. Secured to the inner portions of these shafts 'said'shsfte lying in 4the plane of theeontrol arm' are spurgears Il and Il, respectively. whichmesh is' ' » , acecho@ open the switch at the‘expiration of a given time, she may set only the “Off” dial 'ill for this time interval and then turn the setting knob Qld only to the "On” position, with the control its notch 65a and pointer i8 into any desired an ~member @i latched behind the shaft et. At the guiar position, the time responsive driving gear expiration of this set time interval, the switch will automatically open. f ‘ ‘il and the associated dial it meanwhile remain ing substantially stationary during such adjust Referring now to the interval timer embodi ing operation by reason of the friction slippage `ment illustrated in Figures l0, l1 and l2, this connection it; and adjustment of the other knob embodiment >also has the two rotating tripping @tl is eñ’ective through gears 92 and Se to adjust shafts t5 and t6, but here these two shafts are the other tripping shaft S6 to bring its notch @6a permanently geared together in a ñxed gear ratio. and pointer l@ into any desired angular position, Rigidly secured to shaft 65 is a large spur gear with spur gears t3 and @t which are rigidly se cured to the shafts t5 and 58, respectively. 'Eto tation of the knob et is eiîective through gears @i and Se to adjust the tripping shaft 65 to bring the time responsive driving gear ‘l2 and the as sociated dial il also remaining substantially sta tionary during this adjusting operation by reason Yof its friction slippage connection it. ' " The operation of the above described embodi ment is as followsz--Assuming that the housewife desires to havethe particular heating element of the range go on at three o’clock and to go off at six o'clock, she turns the knob @5 to rotate the pointer ‘lâ into registration with the “3” marking on the "On” dial it, and turns the knob Sti to rotate the pointer i9 into registration with the “6” mark on the "Off" dial lvl. With these two time settings established, she thereupon revolves the setting knob bld to swing/the control member 5i to its extreme righthand position, as illustrated 30 in Figure 6. In this position, the switch contacts 33 and tt are open. During the continued rota tion of the gear ‘li , in response to the operation of the clock movement, the shaft 55 is carried around with said gear through the friction clutch con 35 nection it, and when the “3” mark on the dial 'it and the pointer lâ reach the mark Bi, the notch @Ea in said shaft is in its tangential position and thereupon the control element 5i is snapped back through the first-step of its return movement, into the position illustrated in Figure 7. in this posi tion the switch contacts are closed, thereby clos ing the circuit of the range. Meanwhile, the shaft t@ has also been rotating with its time re sponsive driving gear l2, and when the “6” mark on the dial il, and the pointer ‘li-l, come into sub stantial registry with the stationary mark t2, the notch @da of said shaft is in its tangential position, and thereupon the control member 5l is permitted to snap through the second step of its return movement, into the position illustrated in Figure S. In this position, the switch contacts are open. This completes the cycle of automati cally closing and opening the circuit at predeter mined times. As the control element 5i moves 55 -between each of the positions illustrated in Fig ures 6, 7 and 8, the indicia “Set”, “0n” and “Off” on the target disc 52 appear successively in the sight window @il so that the -housewife can tell instantly the condition of the time switch. In the event that she should wish to close the switch contacts 33, 3d, and have them remain closedindependently of time, it is only necessary l -for her to press inwardly on the setting knob - tid, which serves to thrust the shaft 5ta and 65 arm dit inwardly in opposition to the pressure of the spring 5t, thereby causing the dog dic to ,clear the inner end of the ñxed stop el, so that >the control element can swing down through the last step of its return movement, into the posi 70 tion illustrated in Figure 9, which permits the switch contacts to close. In this position the red target area 53 appears in the window 5t, for indicating that the switch is closed. if the house-l ` wife desires to have the switch closed at once, 75 with the device only functioning to automatically S5, and rigidly secured to shaft t6 is a small spur pinion et. The pinion 96 meshes with a relatively larger gear @l and the latter gear drives a small pinion @t which meshes with the large spur gear 9d. The intermediate gears Si and 98 are secured fast to an arbor 99, which is journaled in the front and back frame'plates i8 and i 9. Fixedly' secured to the front ends of these shafts 65 and t@ are the two indicating dials till and HB2. ln the embodiment illustrated, the above described gear ratio between said shafts is such that the shaft 66 revolves 12 revolutions to each revolu 25 tion of the shaft 65. Corresponding to this gear ratio, the markings ißt' on the dial iti repre sent- one hour of time divided into five minute intervals, and the markings E32' on the other dial m2 represent i'lve minutes of time divided into 30 one minute intervals. This enables the time in terval to be set forany time up to one hour in one minute gradations, or even smaller. It will be understood that in different embodiments and uses of the invention, the gear ratio and the time intervalsmay be otherwise arranged, appropriate to that embodiment or use. Motion is transmitted from the clock movement to the two trippingshafts through a gear i6@ which meshes with a gear itâ mounted on the 40 shaft t6. The latter gear itâ constitutes the time responsive driving element for the two shafts, the motion -transnriitted thereto being such as‘to cause the shaft E5 to rotate once in an hour and to cause the shaft t@ to rotate once in five minutes, 4:5 as above‘described. A friction slippage clutch is interposed between the gear ißt and the shaft 65, this clutch connection also consisting of a spring spider tilt (Fig. 12) similar to the spring spiders ‘it of the preceding embodiment.v ri‘he 50 ends of the spider arms bear against the back side of the gear itâ and the hub of the spider bears against a collar itl on the shaft tt. This fric tion slippage connection permits the two Vshafts to be given their manually adjusted settings, but 55 at other times compels these shafts to rotate in response to the operation of the clock. Both shaftsare set simultaneously by the ma nipulation of one adjusting knob il i, which is secured to a shaft _M2 journaled in the spaced frame plates. `A gear il@ secured to this shaft meshes with an idler ,gear itil, which in turn meshes with the pinion 96, the idler gear being mounted on a suitable spindle or arbor i i5 jour naled.- in the frame plates. ' 65 The oscillatory control assembly di is substan tially the same as that previrmslyv described, with the exception of the cam ¿35, which has only a single lobe ¿350. The third stop is also provided for the control> member, in the form of a pin 70 Si, like that previously described, from which the control member can be released by pressing in wardly on~ the knob äid. The dials iti and ißt are designated “2” and “i”, respectively, on the face plate of the clock. Corresponding thereto, 5 is given a slight lead of operation over the shaft “0n-J2", “On-1”, “Off";.followed by the red tar- a 66 so that for any time setting ci' more than iive minutes, the shaft 65 will be sure to trip ‘the con - get area |53. In the operation of this embodiment, it will be trol member before the shaft E8 has arrived in its assumed that it is desired to close the circuit tripping position. Thus, the ilrst shaft only de through the contacts 33 and 34 and to have this termines the large gradations of time, and the circuit open automatically at a predetermined second shaft determines the short gradations ci’ time. Inasmuch as this second shaft 68 has e. ro`-` time interval later on--say 43 minutes. Prepara tory thereto, the adjusting knob ||| is turned tative speed twelve times' as high as the first 10 the proper amount to have the “40” mark on the shaft, a much higher degree of accuracy for the dial |0| iust past the arrowhead marker 8|,.and short gradstlons of time >can be had from this to have the “3” mark on the dial |02 in register second shaft, thereby avoiding the necessity of the target disc l2 bears the successive indicia: with the arrowhead marker 82. The setting knob extremely accurate machining operations ~and. 5in'. is now rotated in a clockwise direction to avoiding errors from gear backlash, wear, etc. 15 swing the control arm i||b to its extreme right With regard to the second of these advantages, it will be evident that the large scale division of the the shaft 65. The indicia "On-2" now appears second dial |02 into one minute intervals enables in the sight window I4, indicating that the time ' the operator conveniently to set the device for computation is based on the settings of both dials. accurate time gradations over either long or short 20 As shown in Figure 11, this position of the control intervals. When the control arm is in its “Oil” position, ' member disposes the cam lobe lic out of engage ment with Vthe movable switch element, with the against 'the stop 81, the “Oii’” indicia on the tar result that the switch contacts are in engagement get disc appears at the window 5i. Likewise, as and the circuitwis closed. The dials lili and |02 in the previously described embodiment, when the operator desires to close the switch for a utili .25 are rotated in their timed movement in a counter zation of current independently of time, it is clockwise direction, back toward their zero posi tions, and the notches are so related to their only necessary to press inwardly on the setting dials that when the “O” mark of the dial Ml is knob Bld to cause the control arm to clear the . hand position, where it becomes latched behind approximately in register with the arrowhead 'so pointer 8|, the notch “a will be in tripping posi tion, and, likewise, when the "O" mark on the dial |02 is in register with this arrowhead pointer 82, the notch 88m will be in tripping position. It will therefore be seen that substantially at the expira tion of 40 minutes or slightly more, the control member 5| will be tripped through the iirst notch inner end of the stop pin 6l, whereupon the con trol member swings downwardly to the limit of its 30 counterclockwise movement, oscillating the cam lobe Mc out of engagement with the movable switch element and permitting the switch con tacts to close. In this position, the red target area 53 appears in the sight window 54, indicat 35. ing that the switch is closed. ßaethereby swinging back intoengagement with While I have illustrated and described what I the other shaft B6. This still leaves the switch regard to be the preferred embodiments of my contacts closed because the cam lobe has not en '40 gaged the movable switch element. The latter invention, nevertheless it will be understood that such are merely exemplary and that numerous modincations and rearrangements may be made therein without departing from the essence of the g shaft and its dial |l2 have meanwhile been rotat ing at a speed twelve times that of the shaft 85, and when the “0” mark on the latter dial comes into registry with the pointer '82, the notch 86o 45 will arrive in its tangential position, thereby trip ping the control member and permitting it to swing down 'into engagement with the nxed stop Il. This will bring the cam lobe “c into engage ment with the movable switch element, resulting in the opening of the 'switch contacts, Bhould'the operator desire to set the device for ' a short time interval of five minutes or less, this setting is established on the “1” dial, designated |02. For example, if only a B-minute interval is desired, the “,3” on that dial is placed in regis ter with-the fixed marker 82. Thereupon, the invention. - _ I claim:- ' I ' l l. In a time switch, the combination of con tact apparatus, a control member governing said contact apparatus, said control member adapted to be moved from a normal position to a set posi- v tion, means normally tending to cause a unidi rectional return motion of said control member 50 from said set position back to said normal posi tion, tripping stops disposed at different polnts'in the path of such return movement-"time respon sive drivingmeans for actuating said tripping stops to release said control member, frictional 55 motion> transmitting means between s_aid time re setting knob lid is rotated through only the nrst . sponsive` driving` means and said tripping stops, step ~ of its setting actuation, sumcient to latch and means for settingsaid tripping stops relative the control member in engagement with the shaft ß. At'this time the indicia "On-1" on the target disc appears in the window Il, indicating that the time setting is based on the indication of the “1” dial. At the expiration of three minutes, ‘thesero mark on this dial will have returned to ly to said time responsive driving means. A . _ 2. In a time switch, the combination of contact apparatus, an automatic control member, means responsive to the motion 'of said control member for governing said contact apparatus, said control .member adapted to be moved _from a normal posi the'nxed marker I2 and the control element will _ tion to a set position, meansv normally tending to cause a return motion of `'said control member be tripped for swinging back to its switch open from said set position back to said normal posi- ‘ ing’ position in engagement with the stop Il. Attention is vdirected to the fact that vthe use tion, tripping shafts operative to control said re of two trlppinl shafts' for controlling the open turn motion. said shafts having notches therein ' 70 ing of the switch has a two-fold advantage; first, movable into releasing- positions for- releasing said it enables greater accuracy to be obtained in the control member, time responsive driving means - automatic tripping operation, and, second, it en ables small time intervalsto be more accurately established in the setting of the device. Refer ringtotheiirstoftheseadvantageatheshaftil' for moving said’shafts, and means for'setting said shafts Arelatively. to said time responsive driving means. ‘ « . _ 3. `In a time switch, the combination of contact 6 accenno - apparatus, an automatic control member. vmeans responsive to the motion ci said member for gov erning said contact apparatus, said control mem ber adapted to be moved from a normal position to a set position, means normally tending to cause a return motion of said control member from said set position back to said normal position, a plu=` rality of tripping shafts disposed at diñerent lo points in the path of such return movement for causing such return movement to occur in a plu rality of steps, said shafts having notches there in movable into releasing positions for releasing said control member, time responsive driving means for said tripping shafts. frictional means 15 for transmitting motion from said driving means to said shafts. and means for setting said shafts relatively to said time responsive driving means. fi. In a time switch. the combination of contact apparatus. an automatic control member,- means 20 responsive to the motion oi said control member for governing sáid contact apparatus, said control member adapted to be moved from a normal posiß tion to,a set position, means-normally tending to i cause- a return motionof said control member 25 from said set position baclr to said normal po sition, a tripping shaft for holding said controly tact apparatus. said control member adapted to be moved in one direction to a set position, means normally tending to cause a unidirectional return motion of said control member in the opposite direction back from said set position, a ñrst stop member governing said return motion, time responsive means for eñecting' an automatic re lease~ between said ñrst stop member and said control- member, means for adjusting the position of said ñrst stop member relatively to said time responsive means. a second stop member Vgovern ing said return motion, and manually actuated means for enecting a release between said second stop member and said control member. 8. In a time switch. the combination oi' con tact apparatus, a control member governing said contact apparatus, saidcontrol member adapted to be moved from a normal position >to a set position, means normally tending to cause a re position back. to said normal position, a plural ity of tripping stops disposed at diiïerent points in the path of such return movement for causing the return motion to occur in a plurality of steps, ,time responsive driving means for actuating said 25 member in said set position, a second tripping shaft operative to interrupt the return motion tripping stops to release said control member, means for setting said tripping stops in diner ent tripping positions relatively-to said time re» of said control -member between said set posi`= sponsive driving means," anóthen stop member said return 80 tion and said normal position, said shafts having _ governing l notches therein movable into releasing positions for releasing said control member, time respon= .sive driving'means for rotating said shafts, frica tional means for transmitting motion from said 35 time responsive driving means to said shafts. and manually actuated means'i‘or setting said shafts in diderent angular positions relatively toA said so turn motion of said control member from said set otion, and manually actuated means for effetxslëing a -release between said latter stop ‘member and said control mem ber. ~ :ail ` 9. In a time switch, the combination of con tact apparatus. a control member governing said 35 contact apparatus. -saidcontrol member being movable in two diilerent planes, a. time controlled time responsive driving means. ` tripping device operative to govern the motion‘oi’ â. In a. time switch, the combination of con- ~ said control member 'one plane, time respon-- tact apparatus,.an oscillatory control member, \ momiav responsive to the motion of said control member for governing said contact apparatus, manually actuated means for oscillating said sive driving- means for said tripping device, a 40 stop member for governing the motion of said ' ì controlmember, and means for moving said con- ` trol member in the other plane for eñecting re - control member from a normal position to a set , leasel between said stop member and said con position, spring means normally tending to cause e.v return-'motion of said control from said set position back to said normal.` position, a tripping shaft operative to hold said control member in said set position. a second tripping shalt opera-à 50 tive to interrupt said return motionat an intera . trol member. is l0. ln a time switch, the combination oi’ con- ' tact apparatus, a >control member governing said contact apparatus and movable in two different planes, said control member adapted to be moved 50 in one plane from a nórmal position to a set mediate point, said tripping" shafts having tending'to cause a re notches therein rotatable into releasing positions position, means norm for releasing said control member. time respons1 turn motion of' said con l member in said lat- i I» ter plane from said set position back to said sive driving means lor said shafts, irictionel normal~ pontion, a ñrst stop member> governing 55 means for transmitting motion from said driving vsaid return motion, time responsive driving 55 means to vsaid shafts, manually actuated means for -angulen‘ly setting- said tripping shafts rela» means for said nrst stop member adapted to actu i tively to said time responsive driving means, and ate the latter into releasing position, means for indicating means for indicating the settings im-= setting said nrst stop member relatively to said parted to said shafts. - ' l. t. ln a time switch, the combination ci contact apparatus. a'control member governing said con» ' tact apparatus, said control member adapted to ^ , be moved in one direction to a set position, means 65 normally tending to cause a return motion or said controlmember from said set position, a drst stop member governing said return motion. >time responsive means for eñecting an automatic time responsive driving means. a second stopV 60 member governing said return motion, and means for moving seid controll member in the other plane for edecting a release >between said second stop member and said control member. l1. In a time switch, the combination of con tact apparatus, a controlmember governing said contact apparatus comprising a shalt mounted i'or rotative'and shifting movements. said shaft adapted to be rotated from a normal position~ to a set position, means normally tending'to cause a return rotation of >said shaftv from said set position'baclr to said normal position, a time 1re release between said iirst stop member and said 70 control membena second stop member governsV i ing said return motion, and manually actuated means for edecting' a release between said second sponsive tripping device operative to control said stop member and said control member. 7. ina time switch, the _combination oi contact return rotation. a stop. member for interrupting , 75 apparatus, a control member governing said con@ said return rotation. andl means :or sliding said l , / 7 2,050,400 . ing means operatively connectedto said tripping lshaft forlireleasing said control lmember from element for eiîecting~ release of said control mem ber to close said contact members at apredeter 12. In a time switch, the combination of vcori tact apparatus, a control member governing .said .mined time, means for presetting said tripping contact apparatus, said control member adapted element, a second vtripping element disposed 'to arrest said control member at an intermediate po to be moved-from a normal position to a set posi tion, means normally tending to cause a return sition in its return to said normal position there motion of said control member from said set byr permitting said contact members to remain position back to said normal position, a series of in engagement as long as said control member stops -operative to interrupt said return motion at remains in said intermediate position, means for’ operatively interconnecting said timing means spaced points, time .responsive means for auto with said second tripping element- for effecting ' matically-eiîecting release between> said control release of said control member to open said con member and a plurality of said stops, and manu tact members at a predetermined time, and ally responsive means for- manually effecting re lease between said control member and one of means for presetting saidv second tripping 15 said» stop member. said stops. . . _ ' element. - . . 17. Ina timel switch, the combination of con 13. In a time switch, the combination of con tact apparatus, a control member governing said contact apparatus, said control member adapted tact apparatus, a control member governing said contact apparatus, said control Vmember adapted to be moved from a normal position to a set posi 20 20 to have rotative movement from a normal posi tion to a set position, means normally tending - tion, means normally tending tov cause areturn motion of said control member from said set to cause a return rotation of said control mem ber from -said set position back to _said normal position back to said normal position, a plurality of tripping devices operative to control said re turn motion, time> responsive driving means for 2.5 said tripping devices- including means for driving said tripping devices- at different speeds, and means for setting said tripping devices relatively position, a plurality of -stops operative to -inter 25 rupt said .return rotation at spaced points, time responsive means for automatically effecting re _ lease between said control member and one of said stops, and manually responsive means for manually effecting release-between said contro 30 member and one of said stops. , to said timeV responsive driving means. ~ 18. In a time switch, the combination of con ‘ 14..I_n a time switch, the combination of con f tact apparatus, a control member governing said contact apparatus, said“ control member adapted tact apparatus, control mechanism for said con tact apparatus comprising a shaft, 'an arm on to be rnoved from a normal positionto a set posi Vsaid shaft swinging about the axis of ‘said shaft, tion, means normally tending to cause a return 135 a‘plurality of tripping devicesrdisposed substan motion of said control- member from said set position back to said normal position, a pluralityY ' tially concentrically relatively> to said axis and of trippingdevices operative to control said re adapted to have substantially continuous mo ‘tiony during the normal operation of the time ‘ turn motion, time responsive _driving means-for >said tripping devices including means for driving 'said tripping devices at different speeds, and switch,va dog movably mounted on said arm and v4:0 adapted to be latched behind said tripping de vices when said arm is rotated in one direction, manually actuated setting„means for.’ rotating means normally tending to cause rotation of said one of said tripping devices relatively to said arm in the opposite direction, rand time respon sive means for actuating one of »said tripping time responsive driving means: ' devices. . 1 19, In a time switch, the combination of con-. tact apparatus, a control member, said control member adapted to be moved from a normal » 15. In a time switch, the combination of con position to a set position, means normally-tending to cause. a return motion from said set position tact apparatus, a rotatable arm, c’am means re ' sponsive to the motion of said arm for governing said contact apparatus, _a rotatable shaft, a' >`bacl': to said normal position in a direction oppo latch member-mounted on said arm adapted to site to movement to said set position, means re have latching engagement with said shaft when sponsive to said return motion for causing switch ing actuation of said Ccontact apparatus at a .point intermediate the limits of said return mo v'tion and continuously rotating timeeontrolled re leasing meansadapted to be engaged by said . control memberl _and governing said return . said `arm is swung to one position, and means normally tending to cause a motion ofsaidarm in a direction inyopposition 'to said latched en 55 gagement, said _shaft comprising a recessed por tion operative upon rotating into a predeter- mined position to release said arm. time respon motion. . ` ' -20. In a time switch, the combination of con sive driving means for said- shaft, ,frictional slip tact apparatus, a> control member, said control „page means transmitting motion from said driv ing means to said shaft, and means for setting member adapted' to be moved from a normal po said shaft relatively to said time responsive driv ,sition to a set position, means normally tending t'o‘cau'se a return motion from said set position ing means. -` ' “ _' 16.l In a timeswitch f_or electric rangesfand the back to said normal position in a direction oppo , like, in combination, separable contact membersV ,site` to movement to said set position, means re to said return motion for causing said es >`disposed to control the connection of a heating -sponsive contact apparatus to assume a circuit closing element of the range to a current source, a con trol member movable from a normal _position to - condition at one point intermediate the limits of l* a set position for actuating said contact mem- - said return motion and for causing said contact , bers from one circuit controlling position to the _ apparatus to' assume a lcircuit opening condition` 70 other,- means for biasing~ saidv arm from said/set . at another point intermediate the limits of said 70 position to said _normal position .in a reverse return motion, and continuously rotating time direction to that in which it is moved tov said set' controlled releasing means arranged to be _en position, a first tripping element operative to gaged directly by said control member for gov ' hold said control member in said set- position in 75 which said contact members are separated, tim I erning said return'motion. Y 21. In a time switch, the combination of oon r _ 75 2,056,400 tact apparatus, a'controi membergoverning‘said contact apparatus, said control member adapted ,. . to be moved from a normal position to a set position, means normally tending to cause a-‘re Ñ _ l _ , . ' driving member to said 'ili‘st‘holding device, mech anism for mechanicallytransmitting motion i‘rom‘Y said timeresponsivedriving member to said ~sec-v 0nd holding device, each of> said kholding devices turn motion of said control member from said 'being actuated into releasing f position by said 5 set position Back to said normal position, a con tinuously rotating ñrst holding device operative to control, one part of said return motion, a _con tinuously rotatingy second holding'device opera time responsive driving - member, and setting means for changing the Position of one of said holding devices >relativelyvto said time respon sive driving member for adjusting the time when 10 tive to control another part ofsaid .return mo-- said latter holding device is moved into releasing- l0 . tion, each of saidvholding devices being rotatable position. into a releasing position, and time responsive 23. In a time switch, the combination offco'n -means for governing the rotation of said holding . tact apparatus, a control member governing said .devices into their releasing positions. » -contact apparatus, said control member adapted -. 22. In a time switch, the combination of con to be moved from a normal position tol a set l5, tact apparatus, a control member governing saiclv positlommeans normally tending to cause a uni Vcontactapparatus', said control _member adapted directional return motion of said control mem to be moved -from'ay normal position to a set ber from said set position back to said normal position, means normally tending to cause a re-. . position, a tripping device operative to control turn motion of said control member'from said' set position back to said normal position, a time responsive rotatable. driving member havingl sub stantially continuous rotation during the nor ' mai operation of the time switch, a mst holding device operative to control onev part of the return .motion of said control member, a second holding device operative to control another part of said return Imotion, mechanism for mechanically transmitting motion from said »time responsive said return motion, va time responsive driving device for actuatingsaid tripping device, an in dicating dial rotating with one of said devices, a pointer rotating with the other- of said de vices and cooperating with said dial, and adjust-ing means for changing the setting of said trip- 20 , ping device relatively to said time responsive driving .' device. ' _ ' ` .l ' FREDERICK C. HOLTZ.